Title:
ZOOM LENS SYSTEM AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/235471
Kind Code:
A1
Abstract:
Provided is a zoom lens system (10) for imaging, comprising, in order from an object side (11): a first lens group (G1) with negative refractive power that moves at the time of zooming; a second lens group (G2) with a positive refractive power that moves at the time of zooming, the second lens group including an aperture stop (St); and a third lens group (G3) with a positive refractive power, the position of which is fixed relative to the image plane. The second lens group includes: a first sub-lens group (S1) with a positive refractive power arranged on the object side and having the aperture stop; and a second sub-lens group (S2) with a negative refractive power arranged on the image plane side and configured to move independently of the first sub-lens group at the time of focusing.
Inventors:
ABE TETSUYA (JP)
Application Number:
PCT/JP2019/022147
Publication Date:
December 12, 2019
Filing Date:
June 04, 2019
Export Citation:
Assignee:
NITTOH INC (JP)
International Classes:
G02B15/163
Domestic Patent References:
| WO2014087855A1 | 2014-06-12 |
Foreign References:
| JP2003215451A | 2003-07-30 | |||
| JP2010044226A | 2010-02-25 | |||
| JP2008122556A | 2008-05-29 | |||
| JP2015004880A | 2015-01-08 | |||
| JP2016014807A | 2016-01-28 |
Other References:
See also references of EP 3816696A4
Attorney, Agent or Firm:
IMAI, Akira (JP)
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